Bitcoinlib

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* Use fastecda library instead of ecdsa
* Still support ecdsa library as fallback and for Windows
* Use RFC6979 deterministic signatures (from fastecdsa)
* Add support and Travis CI tests for Windows OS
* Add new Signature class to manage and create signatures
* Fix some private key generation issues and add extra tests

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* Add support for accounts in Segwit wallets
* Add segwit key import
* Add support for address only wallets
* Fix and update use of key paths in wallets
* Use a single method for creating wallets, mark create_multisig() as obsolete
* Return and use public keys by default
* Add dunder methods, as_dict() and as_json to main classes
* Use Address class in other classes
* Fix issues with key_depths and paths in wallets
* Update network definitions, add segwit WIFs
* Rename account_key and account_multisig_key methods to public_master()
* Performance improvements in encoding
* Many other code cleanups and bug fixes

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* Fix various issues with updating UTXO's
* Add pyscrypt support thanks to x-falcon
* Fix issues with BlockExplorer and Blockr
* Allow to sign tx with HDKey
* Allow to change wallet key names

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* Fix various segwit issues, add unittests and update docstrings

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* Fix issues with Blockchair, BlockExplorer and CryptoID provider
* Calculate vsize, virtual size for segwit transactions
* Add support for SegWit to CLI wallet
* Allow use of user defined key paths
* Support and use BIP45, BIP48, BIP49 and BIP84 key paths
* Allow to import ypub/yprv/zpub/zprv keys
* Fixed fee and transaction size estimation issues
* Fixed litecoind issues thanks to slush0

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* Added segwit support
* Added support for Python 3.7
* Add support for Blockchair provider
* Add CLTV and CSV timelock support